xl CONTENTS OF VOL. II. 
b. Branchial orifice only furnished with six rays. Sy- 
noicum. Sydneum. Polyclinum. Alpidium. Di- 
demnum. . : ‘ 513 
II. Branchial orifice simple. 
Botryllus. Euclaium. 3 : 515 
Tribe II. 
Body free and moving about in the water. 
Pyrosoma. . . Shit 
Subdivision IT. Interior tunic adhering throughout to 
the external one Salpa. 4 5 ti) Say 
Preparation of Molluscous Animals. ; ib. 
o" {Vie 
ANNULOSA. 
_ General characters, é : 518 
Subdivision I.—ANNULOsE ANIMALS WITH anR- 
TICULATED LIMBS FOR LOCOMOTION. 
General characters. Skin. Muscles. Head. Trunk. 
Thorax, thoracic sternum. Breast, scutellum, pec- 
toral sternum. Abdomen. Members, wings, elytra 
poizers, legs. Nervous system. Eyes. Antenne. 
Masticating organs. Gullet. Dorsal vessel. Stig- 
mata, Trachea. Ovipositor, larva, pupa, imago. . 519 
Order I.— With Branchial Aerating Organs. 
Section ].—MaLaAcosTRAca. 
Tribe I. Podophthalma. 
A. Brachyura. Lambrus.  Corystes.  Portumnus. 
Mantua. Cancer. Pilumnus. Pinnoteres. Ocy- 
pode. Graspus. Homola. Dorippe. Eurynome. 
